From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A521A2AD04; Tue, 26 Aug 2025 13:38:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756215527; cv=none; b=G/WVfQ8Mkq9O1HidfGaYevVf29fhWFT2PLuaefbJOujTDq8qVFN1b26KPIseQAR1zQ6pDHyzNdxWUZa/zDtrRc1XaBXInGoFOYiKqMIatXuakSxfi8JlwrDrIleBFUieQcR2ZtuxrkoVexRrxtpEl83Rhv+mjJ7qehrkMWUvrCQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756215527; c=relaxed/simple; bh=2yiwpAQo2vgTjIDhXw0KkQIrCETNtpWdGabupnL1s5A=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IzHJJ4H4Pum5RyI/0Nnjr/CvBNZ1FKg+QwwYqexGXSo0U15B7QRfR/UDTj5EyMZAo6VhueGMCT83KwRAZxPpV8L2TV5JfcQ4XKab53+AoiYet78EzyP/uDV8tvKb+LaG5OA+LY60vgyPZt+SUGzahauzH8z6yqJheLxr4X1HO+0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=hypzsYry; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="hypzsYry" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2EEB7C4CEF1; Tue, 26 Aug 2025 13:38:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756215527; bh=2yiwpAQo2vgTjIDhXw0KkQIrCETNtpWdGabupnL1s5A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hypzsYryk1EineXGN13y5b7abjXoASohEc80xAPLr5lUG9vQq7wAAP5k4qV6DYs37 1F/xq5Ztpc7H3oY1lIUIobT0D64cjX9IoLIP4ijX3UuT87GjNHoTn8mkDuML0S6P9G /ba/mn6R90DrHFNy3mMJmpN/qEG7W6L1CwtoD/5I= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Alexander Gordeev , kernel test robot , Dan Carpenter , Ryan Roberts , Andrew Morton Subject: [PATCH 5.15 068/644] mm/vmalloc: leave lazy MMU mode on PTE mapping error Date: Tue, 26 Aug 2025 13:02:39 +0200 Message-ID: <20250826110948.183538037@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250826110946.507083938@linuxfoundation.org> References: <20250826110946.507083938@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alexander Gordeev commit fea18c686320a53fce7ad62a87a3e1d10ad02f31 upstream. vmap_pages_pte_range() enters the lazy MMU mode, but fails to leave it in case an error is encountered. Link: https://lkml.kernel.org/r/20250623075721.2817094-1-agordeev@linux.ibm.com Fixes: 2ba3e6947aed ("mm/vmalloc: track which page-table levels were modified") Signed-off-by: Alexander Gordeev Reported-by: kernel test robot Reported-by: Dan Carpenter Closes: https://lore.kernel.org/r/202506132017.T1l1l6ME-lkp@intel.com/ Reviewed-by: Ryan Roberts Cc: Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- mm/vmalloc.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -460,6 +460,7 @@ static int vmap_pages_pte_range(pmd_t *p unsigned long end, pgprot_t prot, struct page **pages, int *nr, pgtbl_mod_mask *mask) { + int err = 0; pte_t *pte; /* @@ -473,15 +474,21 @@ static int vmap_pages_pte_range(pmd_t *p do { struct page *page = pages[*nr]; - if (WARN_ON(!pte_none(*pte))) - return -EBUSY; - if (WARN_ON(!page)) - return -ENOMEM; + if (WARN_ON(!pte_none(*pte))) { + err = -EBUSY; + break; + } + if (WARN_ON(!page)) { + err = -ENOMEM; + break; + } + set_pte_at(&init_mm, addr, pte, mk_pte(page, prot)); (*nr)++; } while (pte++, addr += PAGE_SIZE, addr != end); *mask |= PGTBL_PTE_MODIFIED; - return 0; + + return err; } static int vmap_pages_pmd_range(pud_t *pud, unsigned long addr,